Thorpe, Roger (1996) Heat transfer by forced convection in beds of granular adsorbent material for solid sorption heat pumps. PhD thesis, University of Warwick.

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Abstract

A novel adsorption cycle in which enhanced heat transfer between the
adsorbent and external heat sinks and sources is achieved by forced
convection of refrigerant gas through the adsorbent bed is presented This
cycle is further developed by the use of inert beds to store the heat of
desorption and sensible heat between phases. The performance and utility
of such a cycle will depend on the heat transfer coefficients and pressure
drops that result when the refrigerant gas is circulated through the beds
The heat transfer and pressure drop characteristics of a bed of granular
active carbon were investigated using argon, carbon dioxide and ammonia.
Equipment was designed and built to pass a stream of gas through a bed at
a controlled rate, pressure and temperature. The pressure drop
characteristic was found to conform to Ergun equation and the constants
for the application of that relation to a commonly available granular active
carbon established.
A mathematical model based on a finite difference technique was created
and used to predict the progress of a temperature front in the bed and
derive the heat transfer characteristics from experimental data. Heat
transfer coefficients measured with argon and ammonia appeared
inconsistent with each other and after investigations of the data and
comparison with established correlations were made it was concluded that
carbon during the argon experiments had been contaminated. The heat
transfer results with ammonia and carbon were compared with a modified
version of the Colburn analogy between heat transfer and pressure loss. A
correlation between the Nusselt number and Reynolds number for design
purposes was established.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	T Technology > TP Chemical technology
Library of Congress Subject Headings (LCSH):	Adsorption, Heat -- Transmission, Refrigerants, Carbon -- Absorption and adsorption
Official Date:	September 1996
Dates:	Date Event September 1996 Submitted
Institution:	University of Warwick
Theses Department:	School of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Critoph, Robert E.
Sponsors:	British Gas (Firm) ; Engineering and Physical Sciences Research Council (EPSRC)
Extent:	141 leaves : ill., charts
Language:	eng
URI:	http://wrap.warwick.ac.uk/id/eprint/34618

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